Show where each item starts in the inspiration and sync lists

Items in the inspiration list and the sync result columns now each have
their own background box, alternating between two shades, with a small
gap between them. When a long name wraps over several lines it is
still clear which lines belong together. The sync columns keep their
alternating white and orange text.

tests/integration/test_main_window.gd

@@ -240,3 +240,12 @@ func test_log_adds_one_row_per_point_with_padded_time() -> void:
     var time_pattern: RegEx = RegEx.create_from_string("^\\d\\d:\\d\\d:\\d\\d Crono got a point$")
     assert_object(time_pattern.search((log_box.get_child(0) as Label).text)).is_not_null()
     assert_str((log_box.get_child(1) as Label).text).ends_with("Crono lost a point")
+
+
+func test_inspiration_list_alternates_row_backgrounds() -> void:
+    var rows: Array[Node] = _window.get_node("ScrollContainer/VBoxContainer").get_children()
+
+    assert_int(rows.size()).is_equal(2)
+    assert_str((rows[0] as ListRow).text).is_equal("Chrono Trigger")
+    assert_that((rows[0] as ListRow).get_theme_stylebox("panel")) \
+            .is_not_equal((rows[1] as ListRow).get_theme_stylebox("panel"))